Mulligan... I think I can answer this one


The answer is, if the downline is extended long enough, it doesn't
stay alive at all. It will eventually starve for fuel and quit, or at least stumble.
However...
the engine usually dies, long before that happens, along with the rest of the plane.
Props aren't nearly as efficient in dirt, and our poor little engines simply bog down and die.
It's pretty much an instantaneous event